Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

v3.23.3
Debt (Details) - USD ($)
 9 Months Ended
May 17, 2023
Feb. 28, 2023
Aug. 12, 2020
Sep. 30, 2023
Oct. 05, 2023
Dec. 31, 2022
3.125% Exchangeable Senior Debentures due 2053            
Debt disclosures            
Carrying value       $ 1,316,000,000    
Principal amount   $ 1,265,000,000        
Interest rate (as a percent)   3.125%   3.125%   3.125%
Shares attributable to debentures per $1,000 original principal amount of Debentures   1.8901        
Total shares attributable to debentures   2,390,977        
Debt instrument, face amount per debenture   $ 1,000        
Exchange price of shares attributable to debentures   $ 529.07        
Percentage of redemption and purchase price   100.00%        
Exchangeable Senior Debentures Option            
Debt disclosures            
Principal amount   $ 165,000,000        
2.75% Exchangeable Senior Debentures due 2050            
Debt disclosures            
Carrying value           $ 560,000,000
Interest rate (as a percent)       2.75%   2.75%
1.25% Exchangeable Senior Debentures due 2050            
Debt disclosures            
Carrying value       $ 2,000,000   $ 798,000,000
Interest rate (as a percent)       1.25%   1.25%
1.25% Exchangeable Senior Debentures due 2050 | Subsequent event            
Debt disclosures            
Interest rate (as a percent)         1.25%  
1.75% Exchangeable Senior Debentures due 2046            
Debt disclosures            
Carrying value           $ 15,000,000
Interest rate (as a percent)       1.75%   1.75%
Line of credit            
Debt disclosures            
Carrying value       $ 395,000,000   $ 397,000,000
SPV | Margin Loan Facility            
Debt disclosures            
Carrying value       $ 1,525,000,000   $ 1,400,000,000
Number of business days prior to the maturity date       5 days    
Remaining borrowing capacity       $ 775,000,000    
SPV | Margin Loan Facility | Charter. | Asset Pledged as Collateral            
Debt disclosures            
Shares owned       37,300,000    
Value of pledged collateral       $ 16,400,000,000    
SPV | Margin Loan Facility | Three-month LIBOR            
Debt disclosures            
Interest rate basis     three-month LIBOR      
Basis spread on variable rate     1.50%      
SPV | Margin Loan Facility | SOFR            
Debt disclosures            
Interest rate basis three-month SOFR          
Basis spread on variable rate 1.875%          
SPV | Term loan            
Debt disclosures            
Carrying value $ 1,150,000,000          
SPV | Revolving Credit Facility            
Debt disclosures            
Maximum borrowing capacity 1,150,000,000          
SPV | Uncommitted Incremental Term Loan Facility            
Debt disclosures            
Maximum borrowing capacity $ 200,000,000